Fairfax is a city located in South Dakota. With a 2020 population of 118, it is the 223rd largest city in South Dakota and the 18020th largest city in the United States. Fairfax is currently growing at a rate of 0.85% annually and its population has increased by 2.61% since the most recent census, which recorded a population of 115 in 2010. Spanning over 0 miles, Fairfax has a population density of 390 people per square mile.
The average household income in Fairfax is $47,608 with a poverty rate of 5.84%. The median rental costs in recent years comes to $413 per month, and the median house value is $38,400. The median age in Fairfax is 58.6 years, 54 years for males, and 63.8 years for females. For every 100 females there are 87.7 males.